import QtQuick 2.12
import QtQuick.Window 2.12

Rectangle {
    width: 100
    height: 100
    color: "black"
    MouseArea {
        id: ma
        anchors.fill: parent
        hoverEnabled: true
        cursorShape: Qt.CrossCursor
        onClicked: {
            dot.x = mouseX;
            dot.y = mouseY;
        }
    }
    Rectangle {
        color: "blue"
        width: 1
        height: 1
        x: ma.mouseX
        y: ma.mouseY
    }
    Rectangle {
        id: dot
        color: "red"
        width: 1
        height: 1
        x: -1
        y: -1
        Rectangle {
            width: 20
            height: 1
            x: -10
            z: -1
        }
        Rectangle {
            width: 1
            height: 20
            y: -10
            z: -1
        }
    }
}